os_linux.inline.hpp revision 7260:9ccb94e5c153 
1/*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25#ifndef OS_LINUX_VM_OS_LINUX_INLINE_HPP
26#define OS_LINUX_VM_OS_LINUX_INLINE_HPP
27
28#include "runtime/os.hpp"
29
30// System includes
31
32#include <unistd.h>
33#include <sys/socket.h>
34#include <sys/poll.h>
35#include <netdb.h>
36
37inline void* os::thread_local_storage_at(int index) {
38  return pthread_getspecific((pthread_key_t)index);
39}
40
41// File names are case-sensitive on windows only
42inline int os::file_name_strcmp(const char* s1, const char* s2) {
43  return strcmp(s1, s2);
44}
45
46inline bool os::obsolete_option(const JavaVMOption *option) {
47  return false;
48}
49
50inline bool os::uses_stack_guard_pages() {
51  return true;
52}
53
54inline bool os::allocate_stack_guard_pages() {
55  assert(uses_stack_guard_pages(), "sanity check");
56  return true;
57}
58
59
60// On Linux, reservations are made on a page by page basis, nothing to do.
61inline void os::pd_split_reserved_memory(char *base, size_t size,
62                                      size_t split, bool realloc) {
63}
64
65
66// Bang the shadow pages if they need to be touched to be mapped.
67inline void os::bang_stack_shadow_pages() {
68}
69
70inline void os::dll_unload(void *lib) {
71  ::dlclose(lib);
72}
73
74inline const int os::default_file_open_flags() { return 0;}
75
76inline DIR* os::opendir(const char* dirname)
77{
78  assert(dirname != NULL, "just checking");
79  return ::opendir(dirname);
80}
81
82inline int os::readdir_buf_size(const char *path)
83{
84  return NAME_MAX + sizeof(dirent) + 1;
85}
86
87inline jlong os::lseek(int fd, jlong offset, int whence) {
88  return (jlong) ::lseek64(fd, offset, whence);
89}
90
91inline int os::fsync(int fd) {
92  return ::fsync(fd);
93}
94
95inline char* os::native_path(char *path) {
96  return path;
97}
98
99inline int os::ftruncate(int fd, jlong length) {
100  return ::ftruncate64(fd, length);
101}
102
103inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
104{
105  dirent* p;
106  int status;
107  assert(dirp != NULL, "just checking");
108
109  // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
110  // version. Here is the doc for this function:
111  // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
112
113  if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
114    errno = status;
115    return NULL;
116  } else
117    return p;
118}
119
120inline int os::closedir(DIR *dirp) {
121  assert(dirp != NULL, "argument is NULL");
122  return ::closedir(dirp);
123}
124
125// macros for restartable system calls
126
127#define RESTARTABLE(_cmd, _result) do { \
128    _result = _cmd; \
129  } while(((int)_result == OS_ERR) && (errno == EINTR))
130
131#define RESTARTABLE_RETURN_INT(_cmd) do { \
132  int _result; \
133  RESTARTABLE(_cmd, _result); \
134  return _result; \
135} while(false)
136
137inline bool os::numa_has_static_binding()   { return true; }
138inline bool os::numa_has_group_homing()     { return false;  }
139
140inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
141  size_t res;
142  RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
143  return res;
144}
145
146inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
147  size_t res;
148  RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
149  return res;
150}
151
152inline int os::close(int fd) {
153  return ::close(fd);
154}
155
156inline int os::socket_close(int fd) {
157  return ::close(fd);
158}
159
160inline int os::socket(int domain, int type, int protocol) {
161  return ::socket(domain, type, protocol);
162}
163
164inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
165  RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
166}
167
168inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
169  RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
170}
171
172inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
173  return os::send(fd, buf, nBytes, flags);
174}
175
176inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
177  RESTARTABLE_RETURN_INT(::connect(fd, him, len));
178}
179
180inline struct hostent* os::get_host_by_name(char* name) {
181  return ::gethostbyname(name);
182}
183
184inline bool os::supports_monotonic_clock() {
185  return Linux::_clock_gettime != NULL;
186}
187
188inline void os::exit(int num) {
189  ::exit(num);
190}
191
192#endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP
193